Biological purification method of aquiculture waste water and siphoning reciprocating type biological filter

Abstract

The invention discloses a biological purification method of aquiculture waste water and a siphoning reciprocating type biological filter. The method comprises the following steps: continuously injecting waste water into a purifying cavity of the filter; discharging water through a water discharging pipeline so that the water level in the purifying cavity rises; when the water level in the purifying cavity is higher than the top of a siphoning device, generating the siphoning, discharging water outwards through the water discharging pipeline and the siphoning device together so that the water level in the purifying cavity falls; destroying and stopping the siphoning, and stopping discharging water outwards by the siphoning device; and repeating the steps. The biological purification method and the filter provided by the invention realize the automatic up and down reciprocating movement of the water level by using the siphoning principle, realize the continuous work of a single cavity, enable the relative displacement to be generated between fillers, and realize the self-purification effect; the movement of the fillers improves the mass transfer condition of nutrient substances between a solid phase and a liquid phase on the surface of a biological film, improves the efficiency of the nitration reaction, and has high removing efficiency of ammonia nitrogen and stable operation; and the invention has simple structure, low manufacturing and operating cost, small floor space and wide application range.

Description

Technical field [0001] The present invention relates to the technical field of water treatment of aquaculture systems, in particular to a method for removing ammonia nitrogen (TAN) in aquaculture wastewater and a siphon reciprocating biological filter used in the method. Background technique [0002] In the process of fish farming, various nitrogen compounds are the main waste produced. Among them, ammonia nitrogen is an important component of fish excrement, and it is very toxic to fish. Generally, the total ammonia nitrogen in fish farming waters is required to be no more than 1mg / L, or non-ionic ammonia less than 0.025mg / L. [0003] The biological purification device is an important device of the circulating aquaculture system. It converts the ammonia nitrogen into nitrite and finally into nitrate through the nitrifying bacteria attached to the surface of the filler or suspended in the water body, thereby converting the ammonia nitrogen into less toxic Nitrate nitrogen. [0004]...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the deficiencies of existing biological filters, and provide a filter with high ammonia nitrogen removal efficiency, simple structure, low operating cost, wide application range, small footprint, stable operation and continuous work. The siphon reciprocating biological filter and system

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